
signiert
signed
Provided with a signature, usually by the person who created something (e.g., an author, artist, or athlete).
Er besitzt eine vom Autor signierte Erstausgabe des Buches.
He owns a first edition of the book signed by the author.
signed
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signed
Provided with a signature, usually by the person who created something (e.g., an author, artist, or athlete).
Er besitzt eine vom Autor signierte Erstausgabe des Buches.
He owns a first edition of the book signed by the author.

signed
In computing: provided with a digital signature in order to verify the authenticity and integrity of data or software.
Laden Sie nur Software herunter, die digital signiert ist.
Only download software that is digitally signed.
'Signiert' (signed) is the past participle of the verb 'signieren' (to sign). It is very often used like an adjective to describe a noun that bears a signature.
Ich habe ein signiertes Trikot von meinem Lieblingsspieler.
I have a signed jersey from my favorite player.
Besides being used as an adjective, 'signiert' (signed) is also part of the perfect tense or passive voice with the auxiliary verbs 'haben' (to have) or 'werden' (to be/become).
Der Autor hat mein Buch persönlich signiert.
The author personally signed my book.
You can tell from the context whether a real or digital signature is meant. Words like 'Buch' (book), 'Foto' (photo), or 'Künstler' (artist) point to a handwritten signature, while 'Software' (software), 'E-Mail' (email), or 'digital' (digital) refer to a digital signature.
Die E-Mail war digital signiert und daher vertrauenswürdig.
The email was digitally signed and therefore trustworthy.
In the non-digital world, things that have personal or collectible value are often signed, for example a book, a photo, a work of art, or a jersey.
Ein vom Künstler signiertes Gemälde ist oft viel mehr wert.
A painting signed by the artist is often worth much more.