Sleep deprivation, royalties, and whipper-snappers.
The much-quoted Geneva Convention has little effect on blocking modern "enhanced interogation" techniques, as it was written at a time when torture was largely physical. Modern science has introduced such wonders as stress positions, white noise and sleep deprivation, with only the latter being addressed in the Convention. IIRC, the Geneva Convention only states that a prisoner (and that's a recognised soldier, not an un-uniformed "insurgent"), must have a rest of one hour in each twenty-four hours of interrogation, a figure which would still produce the effects of sleep deprivation in very short order without contravening the rules.
As regards royalties, Gitmo is US teriritory under the terms of the 1903 lease, but it is a military base, so I'm not sure civil copyright law applies. And then there's always the problem that Cuba has claimed Gitmo is an illegal occupation, which implied the military could throw their hands up and insist it was dealt with under Cuban law. Whilst Cuba does have copyright laws, they are mainly around stopping foreigners ripping off Cuban cigar brands, and it is doubtful a human rights violator like Castro would want to many torture questions asked in an Havanan court.
And finally, the youthful Ms Bee - 1978! Whippersnapper!