Un-releasable

verb (used with object), released, releasing.
1.
to free from confinement, bondage, obligation, pain, etc.; let go:
to release a prisoner; to release someone from a debt.
2.
to free from anything that restrains, fastens, etc.:
to release a catapult.
3.
to allow to be known, issued, done, or exhibited:
to release an article for publication.
4.
Law. to give up, relinquish, or surrender (a right, claim, etc.).
noun
5.
a freeing or releasing from confinement, obligation, pain, emotional strain, etc.
6.
liberation from anything that restrains or fastens.
7.
some device or agency for effecting such liberation.
8.
a grant of permission, as to publish, use, or sell something.
9.
the releasing of something for publication, performance, use, exhibition, or sale.
10.
the film, book, record, etc., that is released.
11.
press release.
12.
Law.

the surrender of a right or the like to another.
a document embodying such a surrender.

13.
Law Obsolete. a remission, as of a debt, tax, or tribute.
14.
Machinery.

a control mechanism for starting or stopping a machine, especially by removing some restrictive apparatus.
the opening of an exhaust port or valve at or near the working stroke of an engine so that the working fluid can be exhausted on the return stroke.
the point in the stroke of an engine at which the exhaust port or valve is opened.

15.
(in jazz or popular music) a bridge.
verb (transitive)
1.
to free (a person, animal, etc) from captivity or imprisonment
2.
to free (someone) from obligation or duty
3.
to free (something) from (one’s grip); let go or fall
4.
to issue (a record, film, book, etc) for sale or circulation
5.
to make (news or information) known or allow (news or information) to be made known: to release details of an agreement
6.
(law) to relinquish (a right, claim, title, etc) in favour of someone else
7.
(ethology) to evoke (a response) through the presentation of a stimulus that produces the response innately
noun
8.
the act of freeing or state of being freed, as from captivity, imprisonment, duty, pain, life, etc
9.
the act of issuing for sale or publication
10.
something issued for sale or public showing, esp a film or a record: a new release from Bob Dylan
11.
a news item, document, etc, made available for publication, broadcasting, etc
12.
(law) the surrender of a claim, right, title, etc, in favour of someone else
13.
a control mechanism for starting or stopping an engine
14.

the opening of the exhaust valve of a steam engine near the end of the piston stroke
the moment at which this valve opens

15.
the electronic control regulating how long a note sounds after a synthesizer key has been released
16.
the control mechanism for the shutter in a camera