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- #BEST SOFTWARE SERIAL KEY WEBSITE LICENSE#
- #BEST SOFTWARE SERIAL KEY WEBSITE PLUS#
- #BEST SOFTWARE SERIAL KEY WEBSITE DOWNLOAD#
Consider all the possible ways and build a reliable system (including one that assumes the client is right if the blacklist file can't be downloaded). Now, goodness knows there's a million and one ways this can fail.
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#BEST SOFTWARE SERIAL KEY WEBSITE LICENSE#
In summary (this does assume that you have some programatic method of checking the validity of a license key, such as some sort of checksum or other method): As long as things match (or a match is found), the app is alive otherwise, even if the value in the special file or table is "LIVE", it will still be dead if there is attempt to restore from backup because the timestamp will fall outside your threshold. Keep in mind the larger the range the harder performance will take a hit.). Everytime a page on your application runs, check this value with a hashed version of "LIVE"+salt+timestamp and then permit for a valid range of timestamps (for example, one day, two days, one week, one month, etc. This needs to be hashed with your salt AND a timestamp. This method would store "LIVE" or "DEAD" (or something sufficiently similar) in a table or a file, but again HASHed. Therefore I suggest a second method of protection as well. After all, you've got to store this somewhere internally, which means if it is overly obvious it could be easily subverted, and even if it isn't overly obvious, it can be easily reverted by restoring the appropriate table(s)/file(s). The harder part is going to be keeping the application dead. You could get fancier and have the application send the request to your site and you look it up in a database on the fly, but the file (for what I'm assuming would hopefully be a short list) would hopefully remain small and may be the easiest way.
#BEST SOFTWARE SERIAL KEY WEBSITE PLUS#
MD5 or similar plus a secret should be sufficient for this. If it is found, then the application knows that it should die until the blacklist is removed.
#BEST SOFTWARE SERIAL KEY WEBSITE DOWNLOAD#
Then, on a recurring basis, your software initiates a download of this file (most server-side languages provide for this) and then searches it for the hash of the installed license key. How you manage this file is up to you, but the file itself need only have a hash per line. You need a publicly-available website somewhere that hosts a file containing the hashes of license keys that have been blacklisted. There are many ways to implement something like this, but here's one that shouldn't be too hard to do: