There was a DRM free executable released for DKS years ago, before the Developer's Cut release (which didn't have any DRM to start with).
Contractual issues prevented the removal of the copy protection from the original release of D2:ED.
For The Dragon Knight Saga:
- Make sure you have the latest version of DKS (1.4.9.70). Check the version in the main menu, or if you can't start the game, in the 'bin' subfolder of the main install folder, right click on Divinity2.exe and select Properties, switch to the Details tab and check the File/Product Version.
If you need the patch it can be downloaded
here.
- Download
the zipped DRM free executable, and extract it into the bin folder, overwriting the original (or rename it first, if you wish, but there is not much reason to keep the DRM version).