Re: [PHP] Memory cache problem
On 14 Jun 2008, at 01:02, tedd wrote: At 11:47 PM +0100 6/13/08, Stut wrote: On 13 Jun 2008, at 23:20, R B wrote: I search in both caches, and the video appears in the memory cache. Sorry, but that doesn't answer the question of why you/he doesn't want it to be cached. If he's trying to protect the videos from being copied then you're going to need to make it clear to him that you can't stop that from happening without DRM which is a whole other kettle of fish and usually not worth it. Aside from that I'm not aware of anything else you can do to stop clients caching your content. At the end of the day you have no reliable control over what happens after the data leaves the server. -Stut Caching is one thing, but viewing the video is another -- unless I am mistaken. While it's true that you have no control over the video file once it leaves the server, however, what the file does in a foreign environment is something else. Typically, DRM schemes are needed when someone wants to protect digital media from being copied to play in standard players. But, if you want to restrict playing a video to just your site, then that's another matter. One can place actionscript in the video that will stop it from playing if certain conditions are not met. For example, you can have a file that exits in your site, but no where else. If the video is downloaded and an attempt is made to play it, then the video simply looks for the companion file and if it's not there, then it won't play. Is this not true? Indeed, but things like that are easily stripped. In addition to that most DRM schemes have been broken. It also tends to create issues for some users who may want to view the videos at a time that suits them in a place where it's not feasible to stream it from your website. At the end of the day it comes down to the website and what limitations the users will put up with. Either way it's beyond the scope of this list. -Stut -- http://stut.net/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Memory cache problem
Hello, I´m making a video manual, but i don´t want to be cached in the client machine. I make a script like this: ?php header(Expires: Mon, 26 Jul 1997 05:00:00 GMT); header(Last-Modified: . gmdate(D, d M Y H:i:s) . GMT); header(Cache-Control: no-store, no-cache, must-revalidate); header(Cache-Control: post-check=0, pre-check=0, false); header(Pragma: no-cache); readfile($video_name); ? With Internet explorer the script works fine. But Firefox have two types of cache: Memory cache and disk cache. With firefox disk cache, the script works fine, because don´t appears in the disk cache, but i have problems with the Memory cache. How can i avoid to appears in the firefox memory cache?
Re: [PHP] Memory cache problem
On 13 Jun 2008, at 23:12, R B wrote: I´m making a video manual, but i don´t want to be cached in the client machine. I make a script like this: ?php header(Expires: Mon, 26 Jul 1997 05:00:00 GMT); header(Last-Modified: . gmdate(D, d M Y H:i:s) . GMT); header(Cache-Control: no-store, no-cache, must-revalidate); header(Cache-Control: post-check=0, pre-check=0, false); header(Pragma: no-cache); readfile($video_name); ? With Internet explorer the script works fine. But Firefox have two types of cache: Memory cache and disk cache. With firefox disk cache, the script works fine, because don´t appears in the disk cache, but i have problems with the Memory cache. How can i avoid to appears in the firefox memory cache? Why don't you want it cached? What makes you think it's cached in memory on FF? -Stut -- http://stut.net/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Memory cache problem
The video manual it´s not for me, it´s for a customer and he don´t want to be cached in the client machine... If you put in firefoxin the url area: about:cache , firefox display the Memory cache and the Disk cache... I search in both caches, and the video appears in the memory cache. On Fri, Jun 13, 2008 at 4:17 PM, Stut [EMAIL PROTECTED] wrote: On 13 Jun 2008, at 23:12, R B wrote: I´m making a video manual, but i don´t want to be cached in the client machine. I make a script like this: ?php header(Expires: Mon, 26 Jul 1997 05:00:00 GMT); header(Last-Modified: . gmdate(D, d M Y H:i:s) . GMT); header(Cache-Control: no-store, no-cache, must-revalidate); header(Cache-Control: post-check=0, pre-check=0, false); header(Pragma: no-cache); readfile($video_name); ? With Internet explorer the script works fine. But Firefox have two types of cache: Memory cache and disk cache. With firefox disk cache, the script works fine, because don´t appears in the disk cache, but i have problems with the Memory cache. How can i avoid to appears in the firefox memory cache? Why don't you want it cached? What makes you think it's cached in memory on FF? -Stut -- http://stut.net/
Re: [PHP] Memory cache problem
On 13 Jun 2008, at 23:20, R B wrote: The video manual it´s not for me, it´s for a customer and he don´t want to be cached in the client machine... If you put in firefoxin the url area: about:cache , firefox display the Memory cache and the Disk cache... I search in both caches, and the video appears in the memory cache. Sorry, but that doesn't answer the question of why you/he doesn't want it to be cached. If he's trying to protect the videos from being copied then you're going to need to make it clear to him that you can't stop that from happening without DRM which is a whole other kettle of fish and usually not worth it. Aside from that I'm not aware of anything else you can do to stop clients caching your content. At the end of the day you have no reliable control over what happens after the data leaves the server. -Stut -- http://stut.net/ On Fri, Jun 13, 2008 at 4:17 PM, Stut [EMAIL PROTECTED] wrote: On 13 Jun 2008, at 23:12, R B wrote: I´m making a video manual, but i don´t want to be cached in the client machine. I make a script like this: ?php header(Expires: Mon, 26 Jul 1997 05:00:00 GMT); header(Last-Modified: . gmdate(D, d M Y H:i:s) . GMT); header(Cache-Control: no-store, no-cache, must-revalidate); header(Cache-Control: post-check=0, pre-check=0, false); header(Pragma: no-cache); readfile($video_name); ? With Internet explorer the script works fine. But Firefox have two types of cache: Memory cache and disk cache. With firefox disk cache, the script works fine, because don´t appears in the disk cache, but i have problems with the Memory cache. How can i avoid to appears in the firefox memory cache? Why don't you want it cached? What makes you think it's cached in memory on FF? -Stut -- http://stut.net/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Memory cache problem
At 11:47 PM +0100 6/13/08, Stut wrote: On 13 Jun 2008, at 23:20, R B wrote: I search in both caches, and the video appears in the memory cache. Sorry, but that doesn't answer the question of why you/he doesn't want it to be cached. If he's trying to protect the videos from being copied then you're going to need to make it clear to him that you can't stop that from happening without DRM which is a whole other kettle of fish and usually not worth it. Aside from that I'm not aware of anything else you can do to stop clients caching your content. At the end of the day you have no reliable control over what happens after the data leaves the server. -Stut Caching is one thing, but viewing the video is another -- unless I am mistaken. While it's true that you have no control over the video file once it leaves the server, however, what the file does in a foreign environment is something else. Typically, DRM schemes are needed when someone wants to protect digital media from being copied to play in standard players. But, if you want to restrict playing a video to just your site, then that's another matter. One can place actionscript in the video that will stop it from playing if certain conditions are not met. For example, you can have a file that exits in your site, but no where else. If the video is downloaded and an attempt is made to play it, then the video simply looks for the companion file and if it's not there, then it won't play. Is this not true? Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Memory cache problem
On Fri, Jun 13, 2008 at 8:02 PM, tedd [EMAIL PROTECTED] wrote: At 11:47 PM +0100 6/13/08, Stut wrote: On 13 Jun 2008, at 23:20, R B wrote: I search in both caches, and the video appears in the memory cache. Sorry, but that doesn't answer the question of why you/he doesn't want it to be cached. If he's trying to protect the videos from being copied then you're going to need to make it clear to him that you can't stop that from happening without DRM which is a whole other kettle of fish and usually not worth it. Aside from that I'm not aware of anything else you can do to stop clients caching your content. At the end of the day you have no reliable control over what happens after the data leaves the server. -Stut Caching is one thing, but viewing the video is another -- unless I am mistaken. While it's true that you have no control over the video file once it leaves the server, however, what the file does in a foreign environment is something else. Typically, DRM schemes are needed when someone wants to protect digital media from being copied to play in standard players. But, if you want to restrict playing a video to just your site, then that's another matter. One can place actionscript in the video that will stop it from playing if certain conditions are not met. For example, you can have a file that exits in your site, but no where else. If the video is downloaded and an attempt is made to play it, then the video simply looks for the companion file and if it's not there, then it won't play. Is this not true? are you asking a rhetorical question here tedd? i thought you implemented something like that w/ help of the list some months back. -nathan
