# Participation Report - Licence URLs existing content
**URL:** https://community.crossref.org/t/participation-report-licence-urls-existing-content/1119
**Category:** Reports
**Tags:** licenses, participation-report
**Created:** [11 September 2019 14:05 UTC](https://community.crossref.org/t/participation-report-licence-urls-existing-content/1119 "2019-09-11T14:05:28Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@BrunaErlandsson](https://community.crossref.org/u/BrunaErlandsson)
#### Post date: [11 September 2019 14:05 UTC](https://community.crossref.org/t/participation-report-licence-urls-existing-content/1119/1 "2019-09-11T14:05:28Z")
Yeah, I’m really exploring the PREP 🙂
So, found out I can add License URL on the metadata of existing content by uploading a CSV file, which would save me lot of time!
However, where can I get a CSV file with all the DOIs deposited under a certain prefix?
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### Author:  [@ifarley](https://community.crossref.org/u/ifarley)
#### Post date: [11 September 2019 17:46 UTC](https://community.crossref.org/t/participation-report-licence-urls-existing-content/1119/2 "2019-09-11T17:46:13Z")
Hi @BrunaErlandsson,
Our support team can run a quick report for you to get you a list of DOIs and the resolution URLs we have in our database. I assume the resolution URLs are what you are interested in, right? If so, just send us a message to [support@crossref.org](mailto:support@crossref.org) with your DOI prefix(es) and we’ll send you back a report.
Alternatively, you can also find the resolution URL for any one DOI in our REST API, using this call:
[http://api.crossref.org/works/](http://api.crossref.org/works/)[DOI prefix]/[DOI suffix].xml
Like this example:
[http://api.crossref.org/works/10.1007/978-3-642-46729-5\_4.xml](http://api.crossref.org/works/10.1007/978-3-642-46729-5_4.xml)
---
### Author:  [@BrunaErlandsson](https://community.crossref.org/u/BrunaErlandsson)
#### Post date: [11 September 2019 18:18 UTC](https://community.crossref.org/t/participation-report-licence-urls-existing-content/1119/3 "2019-09-11T18:18:25Z")
> [@ifarley](#):
>
> Our support team can run a quick report for you to get you a list of DOIs and the resolution URLs we have in our database. I assume the resolution URLs are what you are interested in, right? If so, just send us a message to [support@crossref.org](mailto:support@crossref.org) with your DOI prefix(es) and we’ll send you back a report.
Awesome, that’s exactly what I need.
> [@ifarley](#):
>
> Alternatively, you can also find the resolution URL for any one DOI in our REST API, using this call:
>
> [http://api.crossref.org/works/](http://api.crossref.org/works/)[DOI prefix]/[DOI suffix].xml
I pass 🙂 I’m not friends with XML yet, haha…