“We always delete the material when the investigation is over, otherwise people will not participate. Can't we do that anymore? "
If you delete all material, your results may not be verified later. You can at least store the data for verification 3-5 years after the project ends. And if it is valuable information, maybe it can be reused? Consider obtaining consent for e.g. depositing the material in an open archive in anonymized form. Remember that publishing metadata about your research data is also desirable. Documentation of the data then remains even if the data have been deleted.
"Our collaborator wants to store the material in her archives, is that okay?"
It depends. Who owns the data, and who has the right to use it? Does the data contain personal data or other sensitive information and can the collaborator guarantee that this information is handled responsibly throughout the life cycle of the data? If possible, deposit in an open archive.
"Do we really have to sign a contract for the right to use of the data with our collaborator? We have never had to do this before... ”
It is strongly recommended that you secure your right to use the material in the research even if you have collected it on behalf of your collaborator. Likewise, if many people have participated, they can also have ownership rights and thus the possibility of limiting your future use of the material.
“ÅAU requires that I sign an agreement on the transfer of rights. Is ÅAU actually entitled to demand it? Do I have to agree? If I have collected the material, it belongs to me!”
This depends. If you have carried out research "on commission" on a work contract within the framework of funding granted to ÅAU as host, ÅAU may own the data. For grant holders who have funded their own projects, the situation is different.
"What are the age limits for when you have to request the custodian's permission to collect material (interviews, filming, etc.)?"
If the data is collected within normal school activities and meets certain other criteria and you have obtained research permits from e.g. the headmaster and no identifiable information can be stored, the custodian's permission may not be required for children younger than 15 years, provided that an ethics review has been carried out. Children over the age of 15 are generally considered to provide consent for themselves. Filming and interviews can be difficult to anonymize completely and special care must be taken in the collection of such material. Read sections 1.2 and 1.3 here:
"We collaborate with X who manages the contacts with the schools, so we assume that we don't need any additional research permit?"
You need your own research permit or copy of what has been agreed on in order to be sure that everything is in order. If the municipality / unit does not have its own form, you can use the form for request for a research permit.
“I have sensitive material on CD, hard disk and memory stick. Where can I store them? "
You are handling confidential and sensitive material in a risky way and need to immediately transfer your data to responsible and secure storage. Read here.
“Who takes care of cleaning up my material? Metadata - what is that? That's what the library should take care of? "
You know your material and can create it, nobody else can. Metadata or the data description is also for the benefit of potential other users. Provide rich descriptions to help others understand what your data is.
"I travel outside the EU and take my research data with me on a memory stick, in case I have time to analyse it."
Consider leaving the data at home. If you have sensitive data, you need to protect your information in countries with less stringent legislation, for example, by encrypting it.
"What if I have published my data in a repository and I find an error? What do I do then?
Zenodo, e.g., allows you to upload a new version under the same Doi or post. Then those who found the old version also find information that there is a new version while the address is the same. See here.
"Should I rather use these global data access services, like Zenodo?"
You should preferably use the service that is best for your research so that the right users find it. It can be a subject-specific repository. But the repositories should preferably meet certain basic technical requirements to ensure that the material is "discoverable" (gets identifiers like Doi / urn / handle and has shared metadata) and that the data is really kept open and does not suddenly disappear from the network or become chargeable because the service changes its business model. You can search for repositories that meet the FAIR requirements here.
"If I have many kinds of outputs that relate to the same research project - blog posts, graphics, scripts and models, where should I share them?"
The recommendation is to share them where that type of material is shared. Then you can insert the Doi (or url, URLs) of the other material into any description field (the metadata) so that they are linked together. But Zenodo for example receives all kinds of materials so if you want to use fewer services it can be handy.