Hrm. Remember this? https://en.wikipedia.org/wiki/Clipper_chip

Ultimately the US government's key escrow fixation largely faded away, and it was never clear whether it would stand up in the courts, but it still shows up from time to time.

It's quite possible that this would conflict with the EU's can't-believe-it's-not-a-constitution (the Lisbon treaty) if passed, too; for a prior example see the defunct data retention directive, which was nuked by the ECJ: https://en.wikipedia.org/wiki/Data_Retention_Directive