Abstract: The present invention relates to an anti-theft element in an anti-theft device which is intended to be attached to a theft-attractive article such that said device can only be removed from the article with the aid of a special release device. The anti-theft element includes a fouling-substance ampule which contains a fouling substance and which is disposed in the anti-theft element so as to be broken, crushed or otherwise destroyed or opened so as to release said fouling substance if an attempt is made to release the anti-theft device from the theft-attractive article without the aid of said special release device. The ampule (2) encloses a first fouling substance (B; D; G) having a specific fouling property, and at least one second fouling substance (C; E, F; H) having a fouling property which differs from the fouling property of the first fouling substance (B; D; G).

Abstract: The invention relates to a theft-deterrent device intended to be attached to and locked on theft-attractive goods and constructed to co-act with a release device (14) for releasing the theft-deterrent device from said goods (12). The theft-deterrent device includes a first element (2) comprising a base element (4) and a connecting element (6) which projects out from the base element and is intended to be inserted through said goods, and a locking element (8) which is intended to be attached to and locked on said connecting element such as to prevent movement in a direction away from the base element and therewith to hold the anti-theft device securely on said goods. The locking element (8) can be released from the connecting element (6) by means of a temperature-dependent change in form of a release-part (66) provided in the locking element (8) and comprised of a material that has memory properties. The invention also relates to a locking element and to a release device for a theft-deterrent device.