If you own a package, which is encoded with the Zend Safguard Suite you have to install the Zend Optimizer or Zend Guard Loader (as of PHP 5.3) - both are FREE of charge! For more information please go to http://www.zend.com/en/products/guard/runtime-decoders.
Also the zend encoded packages need valid licenses to run. The provided licensefiles for the SetaPDF API are named:
.htSetaPDF-<API-NAME>
Please notice that the filename is also prefixed with .ht. Some systems hide such prefixed files automatically.
For zend encoded packages the name of the license file can be changed and has no real meaning. You can load the licensefile dynamically at runtime in your php script before you use the API:
...or change or add the license path to the following directive in your php.ini:
zend_optimizer.license_path = /path/to/your/license
Zended packages are only available for development- and serverlicenses.