catch and release

Short definition from Wiktionary

Noun

1. 1
   A variety of angling where the fish are released after capture, as a conservation measure.
2. 2
   The immigration policy of releasing illegal immigrants while they await a hearing, rather than detaining them.
3. 3
   The practice of a patent holding company buying a patent, offering a license to its members, and then selling or donating the patent after a certain period.
4. 4
   The practice by police of apprehending someone but then letting them go without making an arrest.
5. 5
   The practice of replacing artifacts in their original location after examining and cataloguing them.